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2.04.7 Hydrology Description <br />(1)(a)(i)(ii)(iii)snd (iv) <br />Method of study: To establish baseline data, 13 drill holes were converted <br />into monitoring wells during the 1982 and 1983 exploration drilling <br />campaign. After drilling, each hole was cased with 4-inch P.V.C., flush joint <br />pipe from the surface to perforated pipe which was located within the strata <br />where data was desired. See monitoring hole completion drawings for <br />details on each hole completed presented in Volume III, Exhibit 3. Of the 13 <br />holes completed, 5 were completed in the overburden above the "D" Seam, <br />5 in the "D" seam, one in the overburden above the "B" Seam, 1 in the <br />Rollins Sandstone formation and 1 in alluvium. <br />The areal extent of the groundwater investigation is generally bounded by <br />Tenor Creek on the West, Hubbard Creek on the East, and the North Fork <br />of the Gunnison River on the South, comprising approximately 6000 acres. <br />For actual monitoring locations see Map 9, Hydrologic Monitoring Location. <br />• The groundwater study was initiated by Coors Energy Corporation in the <br />Spring of 1982. This investigation produced a preliminary map showing <br />hydrologic feature locations and monitoring data for these features during <br />1982 and 1983. In the spring of 1995 the preliminary map was used by the <br />Operator to locate the existing hydrologic features and monitoring was <br />resumed after the features were substantiated in the field. During the fall of <br />1997 the Operator's technical staff examined the surrounding area and <br />identified numerous additional ponds and springs. The Operator believes <br />these field programs were comprehensive and thorough in terms of <br />assessing the surficial hydrologic regime of the entire permit area and the <br />field data obtained and compiled to be accurate and reproducible, within <br />acceptable limits. <br />The Operator considered seeps and springs synonymous during the <br />hydrology investigation. Ponds were presumably recharged by colluvial <br />seepage and as such no quality information is obtained for the ponds unless <br />they are discharging. Within the permit area seeps are common, especially <br />where colluvial material has been excavated to form storage ponds or roads. <br />Seeps are also common at the toe of colluvial material where the material <br />lies within a defined drainage. Seeps are presumably important in <br />maintaining discharge into storage ponds. Typical flows are approximately <br />PR-03 2.04 - 22 - 5/99 <br />